A large, heavy, prominent object that can be used as a weapon for self-defense purposes under circumstances where conventional weapons are prohibited or impractical. An "attitude adjuster" is considered to have served its intended purpose if the mere display of the object is enough to keep potential antagonists at bay. Term is of 1970's-1980's vintage and commonly used by military, law enforcement, and railroaders in urban areas.

"I always keep a three-cell Mag-Lite under the seat when I drive downtown after dark. It's a good attitude adjuster to keep the locals from harassing me..."